And it looks like it wants to be able to sleep.
I lied about ->releasepage being nonblocking. try_to_free_buffers()
is nonblocking, and for a while, ->releasepage had to be nonblocking.
But we can relax that now. I'll put the gfp_flags back into
page reclaim's call to try_to_release_page(). That might help XFS
to play nice with the VM.
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